الأوامر مقابل الأحداث

في هذا الدرس

name messages correctly.

الموضوعات المخطط لها

• A command asks for something to be done: ReserveStock. Imperative name, one intended receiver, can be rejected.
• An event states a fact that happened: StockReserved. Past tense, any number of listeners, cannot be rejected.
• The publisher of an event does not know or care who listens.
• A "command in disguise" like OrderPlacedPleaseReserveStock couples sender to receiver.
• Name events after business facts, not technical changes (OrderPlaced, not OrdersRowInserted).